Best OBD2 Scanner Under $50 (2026): 5 Picks by Function Depth

Compare the picks

Specifications are manufacturer rated, as published on each listing and collected 20 October 2026. “Not stated” means the listing does not give the figure.

How we scored them

Each scanner is scored out of 10 on performance, build, value, safety and warranty, with the weights published on our How We Pick page. The AL329 is the only listing that states certifications, FCC, CE and RoHS, so it is the only pick with a safety score above zero; none of the five states a UL, ETL or CSA listing. Stated warranty terms run from 90 days to 2 years, and one listing states no term, so warranty scores spread widely.

Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score.

What the listings tell you

We compared the five listings. Two state a 2.8 inch screen, one a 1.8 inch color screen, one a 1 inch backlit screen, and one states a 220 by 176 resolution. Three state a code lookup library: 50,000 codes, 30,000 or more codes, and a built-in library with no count given. Four state live data, and all five state freeze frame and I/M readiness. One listing states no warranty term; the other four range from 90 days to 2 years. Two listings contradict themselves on vehicle coverage, and the reviews below call those out.

Buying guide: best obd2 scanner under 50

Reading and clearing is the baseline

Every reader here reads and clears diagnostic trouble codes and turns off the check engine light. Clearing a code does not fix the fault: if the problem remains, the light comes back. Use the reader to see the code, then decide whether the repair is a driveway job or a shop job.

Live data separates the field

Four of the five stream live data, which shows what sensors report while the engine runs. The SC103 draws it as text and graphs at the same time, and the AL329 graphs, records and plays it back. The MS309 does not state live data, so choose it only if plain code reading is enough. For more on choosing, see our how to choose an OBD2 scanner guide.

Screen and buttons

Bigger screens show more at once: the WEJOWE and SC103 state 2.8 inches, the Xiauodo 1.8 inches in color, and the MS309 a 1 inch backlit screen. The Xiauodo adds dedicated I/M and DTC shortcut keys, and the AL329 answers I/M readiness with one key press and LED feedback.

I/M readiness before inspection day

All five state I/M readiness, which reports whether the emission monitors have run since the last code clear. The AL329 makes it a one-button check with green, yellow and red LEDs plus audible tones. Run it before a state inspection so a not-ready monitor does not surprise you.

Warranty and support

Stated terms here are 2 years, 1 year, 12 months and 90 days, and the AL329 states none. A reader with no stated term can still clear codes fine, but it scores zero on warranty, which is why it sits third instead of higher.

Garage Fit Check

• Space: every pick is a handheld reader. The SC103 listing says it fits in a glovebox, the WEJOWE includes a canvas storage bag, and the Xiauodo and MS309 are stated at 5 ounces and 8.8 ounces.
• Power: the MS309 and SC103 state no batteries are needed, drawing power from the OBD2 port; the WEJOWE includes a Type-C cable for its PC printing function.
• Cable and screen: the Xiauodo lists a long, flexible cable. Screen sizes stated are 2.8 inches on the WEJOWE and SC103, 1.8 inches in color on the Xiauodo, and 1 inch backlit on the MS309.
• Before the first job: confirm your vehicle is a 1996 or newer OBD II model with a 16-pin port, note the MS309 exclusion of post-2017 FCA vehicles with the Secure Gateway system, and check the Xiauodo coverage notes if you drive a truck.

Frequently Asked Questions

Will these scanners work on my car?

All five state compatibility with 1996 and newer OBD II vehicles, which covers US cars, light trucks and SUVs back to 1996. Note the exceptions: the MS309 states it cannot work with FCA vehicles (Chrysler, Dodge, Jeep and others) produced after 2017 because of the Secure Gateway system, and the Xiauodo bullets disagree about trucks, so confirm coverage for your own vehicle before ordering.

Can a scanner under $50 turn off the check engine light?

Yes. Every pick here reads and clears codes, which turns the light off. The light returns if the underlying fault is still there, so treat a returning light as the car asking for a repair, not another clear.

Can these check ABS, airbag or transmission systems?

Not per these listings. The WEJOWE states it covers the engine system only, and the others describe engine-code functions. For ABS and SRS coverage, see our best OBD2 scanner for ABS and SRS guide.

What is the one-click I/M readiness check?

On the AL329, one key press checks the state emission monitor status and reports it with green, yellow or red LEDs plus audible tones. Green means the monitors are ready; yellow or red means something needs attention before an inspection.

What does Auto VIN do on the AL329?

It reads the vehicle identification number, plus CALID and CVN, automatically to simplify code retrieval. The listing states it works on vehicles before 2017.

Related: our WiFi vs Bluetooth OBD2 scanner comparison, the best OBD2 scanner for check engine light guide, multimeter vs OBD2 scanner and OBD2 scanner types. Also see our bidirectional scan tool vs code reader, Bluetooth vs standalone OBD2 scanner and wired vs wireless OBD2 scanner. Also see our what do OBD2 codes mean.